Energy Secretary Rick Perry’s plan to make the U.S. electrical grid great again starts with rolling back the Obama administration’s “politically-driven policies” that forced coal and nuclear power plants to retire in recent years.

“These politically-driven policies, driven primarily by a hostility to coal, threatened the reliability and the stability of the greatest electrical grid in the world,” Perry said at an Energy Department conference in Washington, D.C. Tuesday morning.

“It’s not reasonable to rely exclusively on fossil fuels,” he said. “It’s not feasible to rely exclusively on renewables.”